1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
--------------------------------------------------------------------------------
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Hakyll.Core.Compiler
( Compiler
, getUnderlying
, getUnderlyingExtension
, makeItem
, getRoute
, getResourceBody
, getResourceString
, getResourceLBS
, getResourceFilePath
, Internal.Snapshot
, saveSnapshot
, Internal.load
, Internal.loadSnapshot
, Internal.loadBody
, Internal.loadSnapshotBody
, Internal.loadAll
, Internal.loadAllSnapshots
, cached
, unsafeCompiler
, debugCompiler
) where
--------------------------------------------------------------------------------
import Control.Applicative ((<$>))
import Control.Monad (when)
import Data.Binary (Binary)
import Data.ByteString.Lazy (ByteString)
import Data.Typeable (Typeable)
import System.Environment (getProgName)
import System.FilePath (takeExtension)
--------------------------------------------------------------------------------
import Hakyll.Core.Compiler.Internal
import qualified Hakyll.Core.Compiler.Require as Internal
import Hakyll.Core.Dependencies
import Hakyll.Core.Identifier
import Hakyll.Core.Item
import Hakyll.Core.Logger as Logger
import Hakyll.Core.Provider
import Hakyll.Core.Routes
import qualified Hakyll.Core.Store as Store
--------------------------------------------------------------------------------
-- | Get the underlying identifier.
getUnderlying :: Compiler Identifier
getUnderlying = compilerUnderlying <$> compilerAsk
--------------------------------------------------------------------------------
-- | Get the extension of the underlying identifier. Returns something like
-- @".html"@
getUnderlyingExtension :: Compiler String
getUnderlyingExtension = takeExtension . toFilePath <$> getUnderlying
--------------------------------------------------------------------------------
makeItem :: a -> Compiler (Item a)
makeItem x = do
identifier <- getUnderlying
return $ Item identifier x
--------------------------------------------------------------------------------
-- | Get the route for a specified item
getRoute :: Identifier -> Compiler (Maybe FilePath)
getRoute identifier = do
provider <- compilerProvider <$> compilerAsk
routes <- compilerRoutes <$> compilerAsk
-- Note that this makes us dependend on that identifier: when the metadata
-- of that item changes, the route may change, hence we have to recompile
(mfp, um) <- compilerUnsafeIO $ runRoutes routes provider identifier
when um $ compilerTellDependencies [IdentifierDependency identifier]
return mfp
--------------------------------------------------------------------------------
-- | Get the full contents of the matched source file as a string,
-- but without metadata preamble, if there was one.
getResourceBody :: Compiler (Item String)
getResourceBody = getResourceWith resourceBody
--------------------------------------------------------------------------------
-- | Get the full contents of the matched source file as a string.
getResourceString :: Compiler (Item String)
getResourceString = getResourceWith resourceString
--------------------------------------------------------------------------------
-- | Get the full contents of the matched source file as a lazy bytestring.
getResourceLBS :: Compiler (Item ByteString)
getResourceLBS = getResourceWith resourceLBS
--------------------------------------------------------------------------------
-- | Get the file path of the resource we are compiling
getResourceFilePath :: Compiler FilePath
getResourceFilePath = do
provider <- compilerProvider <$> compilerAsk
id' <- compilerUnderlying <$> compilerAsk
return $ resourceFilePath provider id'
--------------------------------------------------------------------------------
-- | Overloadable function for 'getResourceString' and 'getResourceLBS'
getResourceWith :: (Provider -> Identifier -> IO a) -> Compiler (Item a)
getResourceWith reader = do
provider <- compilerProvider <$> compilerAsk
id' <- compilerUnderlying <$> compilerAsk
let filePath = toFilePath id'
if resourceExists provider id'
then compilerUnsafeIO $ Item id' <$> reader provider id'
else fail $ error' filePath
where
error' fp = "Hakyll.Core.Compiler.getResourceWith: resource " ++
show fp ++ " not found"
--------------------------------------------------------------------------------
-- | Save a snapshot of the item. This function returns the same item, which
-- convenient for building '>>=' chains.
saveSnapshot :: (Binary a, Typeable a)
=> Internal.Snapshot -> Item a -> Compiler (Item a)
saveSnapshot snapshot item = do
store <- compilerStore <$> compilerAsk
logger <- compilerLogger <$> compilerAsk
compilerUnsafeIO $ do
Logger.debug logger $ "Storing snapshot: " ++ snapshot
Internal.saveSnapshot store snapshot item
-- Signal that we saved the snapshot.
Compiler $ \_ -> return $ CompilerSnapshot snapshot (return item)
--------------------------------------------------------------------------------
cached :: (Binary a, Typeable a)
=> String
-> Compiler a
-> Compiler a
cached name compiler = do
id' <- compilerUnderlying <$> compilerAsk
store <- compilerStore <$> compilerAsk
provider <- compilerProvider <$> compilerAsk
let modified = resourceModified provider id'
if modified
then do
x <- compiler
compilerUnsafeIO $ Store.set store [name, show id'] x
return x
else do
compilerTellCacheHits 1
x <- compilerUnsafeIO $ Store.get store [name, show id']
progName <- compilerUnsafeIO getProgName
case x of Store.Found x' -> return x'
_ -> fail $ error' progName
where
error' progName =
"Hakyll.Core.Compiler.cached: Cache corrupt! " ++
"Try running: " ++ progName ++ " clean"
--------------------------------------------------------------------------------
unsafeCompiler :: IO a -> Compiler a
unsafeCompiler = compilerUnsafeIO
--------------------------------------------------------------------------------
-- | Compiler for debugging purposes
debugCompiler :: String -> Compiler ()
debugCompiler msg = do
logger <- compilerLogger <$> compilerAsk
compilerUnsafeIO $ Logger.debug logger msg
|
